Struct ConstantTimeResult 

pub struct ConstantTimeResult {
    pub is_constant_time: bool,
    pub mean_time: Duration,
    pub std_dev: Duration,
    pub max_variation: Duration,
    pub sample_count: usize,
    pub confidence: f64,
}

Result of a constant-time verification test.

This struct contains the comprehensive results of analyzing an operation’s timing behavior to determine if it executes in constant time. Constant-time operations are critical for preventing timing-based side-channel attacks that could leak cryptographic secrets.

Interpretation

• is_constant_time = true: Operation appears constant-time within measurement precision
• confidence >= 0.9: High confidence in the verification result
• max_variation / mean_time <= 0.1: Timing variation is acceptably small

Statistical Analysis

The verification uses statistical analysis of execution times:

• Collects multiple samples to account for system noise
• Calculates mean, standard deviation, and maximum variation
• Compares variation against configurable thresholds

Limitations

• Statistical verification cannot prove constant-time behavior absolutely
• System noise and measurement precision affect results
• Formal verification is needed for absolute guarantees

Fields

is_constant_time: bool

Whether the operation appears to be constant-time based on statistical analysis This is a probabilistic assessment, not an absolute guarantee

mean_time: Duration

Mean execution time across all samples Represents the expected execution time under normal conditions

std_dev: Duration

Standard deviation of execution times Measures timing jitter and system noise

max_variation: Duration

Maximum timing variation observed between samples Indicates the worst-case timing difference that could leak information

sample_count: usize

Number of timing samples collected for analysis More samples provide higher confidence but take longer to collect

confidence: f64

Confidence level in the verification result (0.0 to 1.0) Higher values indicate stronger evidence for constant-time behavior

Trait Implementations

impl Clone for ConstantTimeResult

fn clone(&self) -> ConstantTimeResult

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ConstantTimeResult

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.